Adam has some blue stickers and red stickers.
The number of blue stickers is increased by 20% to 60.
The number of red stickers is increased by 50% to 75.
- How many stickers are there at first?
- How many stickers are there in the end?
|
Blue |
Red |
Before |
100% |
100% |
Change |
+ 20% |
+ 50% |
After |
120% = 60 |
150% = 75 |
(a)
100% + 20% = 120%
120% of blue stickers = 60
100% of blue stickers =
60120 x 100 = 50
100% + 50% = 150%
150% of red stickers = 75
100% of red stickers =
75150 x 100 = 50
Number of stickers at first
= 100% of blue stickers + 100% of red stickers
= 50 + 50
= 100
(b)
Number of stickers in the end
= 60 + 75
= 135
Answer(s): (a) 100; (b) 135